I am seeking a reliable supplier for a bulk purchase of organic castor oil. The desired quantity is 500 litres, and I require a product that meets organic certification. It is vital that the oil is sourced sustainably, and the supplier should provide documentation to verify this. Additionally, I am looking for competitive pricing and a breakdown of shipping costs to the UK. If you can fulfil these criteria, I would love to discuss further details and see if we can establish a long-term partnership.